5 Groszy - Nikolai I

Poland had no independent monetary authority in this period — the Warsaw Mint operated under direct Russian imperial supervision following the Congress of Vienna's reorganization of 1815, which reduced the Kingdom of Poland to a constitutional monarchy under the Tsar. After the failed November Uprising of 1830–31, Nicholas I stripped Poland of its constitution entirely, yet the mint continued producing Polish-denominated coinage through 1840, a bureaucratic inertia that outlasted the political settlement it nominally served.

The billon alloy — barely a tenth silver by later reckoning — placed this denomination firmly in the poverty of everyday small change, the kind of coin that wore quickly and was replaced without sentiment.